Machine control mechanism



Feb. 13, 1945. R. JoNGEDi/K MACHINE CONTROL MECHANISM v 2 sheets-sheet 1Filed Sept. 3, 1941 Feb. 13, '1.945.

R. JONGEDYK MACHINE CONTROL MECHANISM 2 Sheets-Sheet 2 Filed Sept. 3,1941 extruding operation; andi` Fig. a wiring diagram of, theelectriealop!` eratngcircuit for the automatic. stop mechaf Patented Feb. 13,`1945 UNITED STAT `MACHINEcoN'rRoL MEGHANISM `Ralph .longerlylg`Hinsdale, Ill., assignorto Western Electric Company, Incorporated, New

` lYork,` N.` Y., a corporationof `New Yorke s, 194.1,seria1Nm 409,371

` `Amilcation September 4 olaims (o1. `,zins-z5 `bottom of the `This`invention `relates `to machinecontrol mechanisms, and moreparticularlyto an autol matcstop mechanism for presses and the` like.`

An object of the inventionisto providea smple,` inexpensive and reliablecontrol mechanism for power operated machines. 1 l l forms the bottom:of the extruded container. 4

\ The extruding `press illustrated in the drawings comprises i Vavertically reciprocable punch or l plunger lll (Figs. `2Hand. 3) and acooperating die Il,y the latter being `mountedin a die holder Oneembodiment of the invention contemplates the `provision `of a controlmechanismjfor exl truding presses, whereby the press may be stoppedautomatically tol prevent damage to the` punch and die and delays due topile-np"7 `of defec-t tive articles `on the punch and in thefdie whenthe` machine `fails to properly discharge? apreviously Vextrudedarticle. In 'ar preferred form ofr extruding` press vcontrol `mechanismembody- `ing theinvenion,` the actuationof' the usual onerevolutionclutch toinitiate. each extruding cycle 1 nfl the.` pressrequiresvthe`closing of af normally open electrical` 'switch which is `adapted `tobeclosed momentarily Vby' previously extruded ar-l` ticl'es only when theyare. properly discharged Other features and advantages ofthe invenf` ltion will become apparentfrom the following cle-` tailed description`when read in conjunction with" the `accompanying drawings, `in which ll l yFig. I is a fragmentary plan view of an ex-f mechanism `.embodyingthe invention;

Fig.. 2 isf a fragmentary "front"` elevationalview,`

truding press equipped with an automaticstop` thereof;

rig. `3i is `a fragmentary side elnational` View,`

Fig. 4" isl ant` enlarged fragmentary planl view of a portion of thestopmechanism with the parts shown in different positions than in" Fig.1;`

Fig. 5"`is"an enlarged', fragmentary section` on` 1 linesya-sofrigg; s

Fig. 6 is a fragmentary vertical sectionalview of thefextruding punch`and die` ilhistrating` the 3 flow upwardlyalong the shank ofrtheqpunchto form the wall of@ theacontairxes; while the. por-.1`

tion` of fthe metal` blank rexnainine:` l between `the cavity by hand,but in the illustrated embodiment 1 oflthe invention, mechanical feeding`means in the formof an oscillatory` arm 22 is provided for `feeding theblanks, "one at a` time, into theldie feeding arm carries a cam`` roller25," which is heldby a spring 26` against `a. cam 21. "Ihecam-` is xedto arcam" shaft 28 and' is designed to im` l part one completeoscillatory movement to the l blankfeeding arm for eacnrevolution of thecam shaft.- The-cam shaft is driven by suitable meansf catoryram of thepress and makes one revolu` l fromthe die cavity. y2in'upstanding wallor barl2 attached ,to a stationary die supporting platen` I3,` onlyaportion cfwhich is `shown in the drawk ings. `The extrudng Vpunchisattached `in the usualwmanner to a punchholder `(not shown) which,` inturn, `is attached to the reciprocatory platen or ramof thepress.

` t `The die `has a die cavity l5 adapted toreceive the slightlyenlarged end portion ISof the punch, ,i which .isof somewhatl'smallercross section than .i the idie cavity. `The construction` is such thatwhen a metal blank zu (Fig. 2) `placed in the die cavity.. `is`compressfedlby the punch, a portion of the, blank is extruded orV`squeezed upwardlyf through `the space between the punch andv the wallof the die cavity. jThe extruded portion of `the metal blank flowsupwardly along the shank of the punch to form the wall I5 of an extrudedcontainer l'l,I asshown in Fig; 6, while the portion ofthe blankremaining `.between the end ofi the punch and thebottom of the diecavity forms the bottom of the container;

[The metal bIanksmay be inserted into the die cavity. This `blankfeeding' j arm "is pivotally mounted `intermediate its ends" on a fixedvertical shaftUZIi` (Fi`g;` 1) andisformed at one end with a `blankengaging portion 24", which is horizon-` tally movable aboVeth'e` uppersurface of Athe die and die holder.` At its opposite end, the blank(none shown) in synchronism with the reciprotionA foreach reciprocationof the ram.

The cam '2:1 is designed ttractuatethe` blank feeding arm to feed theblanks1 into the die cavity while theextrudingpunch is elevated orretracted rier 2li'I may be; .providedz adjacent1-the die cavity forgnidingtheblanks into,4 the die cavity; VSuit-fable means: (none: shownmay be provided for supplying` the blanks tothe blank` feeding arm;`

punch and the bottom of the die' or they may be manually placed, one ata time, in front of the blank engaging portion 24 of the arm in theposition indicated in broken lines in Fig. 1.

In extruding presses of the type above referred to, mechanism is usuallyprovided for stripping the extruded articles from the punch as thelatter is elevatedor retracted from the die cavity. A preferred form ofthe stripper mechanism is disclosed in my co-pending application, SerialNo. 383,151, filed March 13, 1941. However, other forms of mechanical orpneumatic stripper mechanisms may be employed with satisfactory results.

After being stripped from the extruding punch, the extruded containersare discharged from the press so as to free the punch and die for thenext extruding cycle. In the illustrated embodiment of the invention,the extruded containers, after being stripped from the punch, arepropelled into a receiving chute 30 by compressed air. from anozzle 3|,only a portion of which is shown; The receiving chute may be of anysuitable construction capable of directing the containers into asuitable collecting receptacle '(not shown). The chute illustrated inthe drawings comprises a horizontal tubular portion 300 (Fig. 1) -ofrectangular cross section and its side walls have reduced extensions32-32 which project forwardly above the die and die holder to pointsadjacent to and on opposite sides of the die cavity. The top wall of thechutehas an up'- wardly curved portion 33 at its forward end, whichserves to tilt the extruded containers from a vertical position to aVhorizontal position as they are blown into the mouth of the chute, asillustrated in broken lines in Fig,l 3. z

In accordance with an important feature of the present invention,Vmechanism is provided for automatically stopping or interrupting theoperation of the press whenever a previously extruded container is notproperly discharged into the receiving chute 30. This mechanismcomprises a normallyopen electrical control switch 34 (Figs. 1,3 and 4)which is mounted on a bracket 35 attached to the stationary platen I3 ofthe press. The switch has a leaf spring type of operating arm 3B, whichis adapted to be actuated by a cam 31 keyed to a vertical shaft 38 whichis rotatably journalled in spaced bearing portions 39 and 40 of thebracket 35. Extending transversely from the upper end of shaft 38 is anarm 42, which protrudes' into the mouth of the chute 30 through anelongated slot'44 in one of the side wall extensions 32 of the chute.'I'he arrangement is such that the free end of arm 42 normally lies inthe path of extruded containers which are propelled into the chute .bythe blast of `air from the nozzle 3 l. Thus, each extruded containerthat is discharged into the chute strikes the free end of arm 42 andpushes it rearwardly from the position shown in Fig. 1, whereby theshaft 38 and cam 31 are turned counter-clockwise, as shown in Fig. 4, toa position wherein the icam closes the normally open control switch 34:A

I leaf spring 45 is attached at one end to bracket 35 and its free endcooperates with a holdinglcam 46 on shaft 38 to yieldably hold the shafteither in the normal position or in the switch closing position. As bestshown in Fig. 5, the holding cam 46 has two flat surfaces 41-41 forengagement by leaf spring 45 to hold shaft 38 and switch closing ,cam 31either in the normal position shown in Fig. 1 or in the switch closingposition shown in Fig. 4,

.end to one end of a horizontal link 52 (Figs. 2

and 3). At its opposite end, thelink 52 is pivotally connected tothelower end of a vertical post 53 attached to and depending from the blankfeeding arm 22. The construction and arrangement just described is suchthat during each blank feeding movement of the blank feeding arm, thelever 48` vis turned counter-clockwise y(Figs. 1 and 4), so that thefree end thereof engages and cooperates with the cam finger to restoreshaft 38, cam 31 and arm 42 to their normal positions,

As shown schematically in Fig. 7, the normally open switch 34 isincluded in an electrical control circuit which also includes a normallyclosed switch 55 arranged in parallel with switch 34. The controlcircuit is connected by line wires 56 and 5T to asuitable source ofelectrical current (not shown). Also included in the control circuit isa manually operated two-position* push button switch 58,` a magneticswitch 59 and an energizing winding 60 of an electrical solenoid foroperating' the usual one-revolution clutch (not shown)` of the press. i

The several control switches and the energizing winding 60 of theclutchoperatingsolenoidare connected in the control circuit as shown inFig. 7, wherein the several switches are illustrated in their normalpositions, that is, in the positions they assume when the press is atrest with the extruding punch in its elevated position `and the manuallyoperated switch 58 released. The switch 55, as stated above, is normallyclosed. This switch is adapted to be opened momentarily, once duringeach cycle of operation of the press, by a spring pressed bell cranklever 63 (Fig, 1) under the control of a cam 64 on the cam shaft 28 ofthe press. This cam has a recess or depression 65 which, at the propertime, permits spring pressed bell-crank leverA 63 to open switch The cam64 is designed and arranged so y 55. that the switch 55 is openedmomentarilyduring that portion of each press operating cycle in whichcompressed air is applied through nozzle 3| to eject a previouslyextruded container into the receiving chute 3U.

As described above, each extruded container that is properly ejectedfrom the punch and die and discharged into the receiving 'chute actuatesswitch operating arm 42 and thereby closes the switch 34. Thearrangement is such that'during the normal operation of the press,switch 34 is closed by a properly ejected container just prior to themomentary opening of cam controlled switch 55, and the latter switch isre-closed prior to the re-o-pening of switch 34. Thus, during the normaloperation of the press and, as long as the extruded containers areproperly ejected, either one or the other of control switches 34 and 55is closed at all times, so that as long as the main control switch 58 ishelddepressed, the press will operate continuously in automaticallyrecurring cycles.r However, if, for any reason, an extruded container isnot properly ejected from the punch and die and discharged into thereceiving chute trolled switch 55 is closectl Thus, assuming thatwrthemanually `.shown `in Fig; Fl, the operating froman inspection-of Fig.`7, that the timeotne` press= is automatically stopped due to thede-energiza`tion ol' the clutchoperating solei noldimmediatelyuponthefopening of 'control` i switch155,`

` hich causes cle-energization and, consequently, the opening ofmagneticswitch 59 in l `2,389,298 in 'time 1toclose control switch Statthe proper the energizing circuit of the clutch operating sole- Inconnection withtthe following brief descripL tion of the operaticnrof`the press,:itshoultlE be understood' Jthat the,` caml shaft 28 isdriven continuously in automatically recurringcycles l as long `astheswitch `3l! is., closed `by a properly ejected containerduringeachoperating cycle. l i l If for any reason `an extrudedoontainer isnot properly ejected from the punch and' die and discliargedinto thereceiving chute; lswitchwidl` remains open, so that upon the opening ofswitch f -55 the energizing circuit of magnetic switch 5&1l

through .the usual` one-revolution clutch (not shown) 'andrthat eachrevolution ofthe camshaft operates `the press through one,`and` onlyone, complete operating cycle.` At the beginningof each operating'cycle,the punch is. in` its' elevated position, as shown` in Figs. 2'

as shownfin Figur?.

switch 58 inits released or' upfn position; as coil otV magnetic switch59 `will be4 energized by current? supplied `theretothrough closedswitch 55 andthe upper contacts oiswitch 58.' Magnetic switch 59 will,therefore, `be closed, as shown, and itwill be noted, magnetic switch isadaptedfto be held closed by current `supplied thereto through itsowncontacts as long as' eitherone of theswtches 434 and 55 is closed. IAssuming that cam controlled switch 55 and magnetic switch 59 arelbothapparent that upon depression` to bridge its lowercontacts, `anenergizing circuit is establishedthroughthe operatingcoil 60 oi theclutch operating solenoid, whereby the clutch is operated in the `usualmanner, thus starting the operation of the press. The punch descendsinto pressing engagement with the blank 2n previously inserted into thedie cavity,

After the extruding punch has moved upwardly `a sufficient distance tocomplete thestripping .of`

thelextruded container therefrom, the container l is yblown into thereceiving chute, by a :blast of air from the nozzle 3|. Upon enteringthe mouth of the chute, the container engages the free end i of arm 42,turning it counter-clockwise, as shown in broken lines inFig. {1.Shaft`38 and switch closing cam 31 are thus rotated.counter-clockwise fromthepositions shown in Fig, `1 `toward the positions, shown in Fig. 4.The extent of this angular movement of f shaft 33 and cam `3l issufficient to enable the` leaf spring 45, throughits cooperation withflat surfaced cam 46, to com@ plete the counter-clockwise movement ofthe parts with a snap-like action. Switch 34is there?,

Shortly` thereafter, cam

by closed byfcam 3'l.` 64 on camshaft 2B arrives inthe position in whichits depressed portion 65 permits bell-crank 63 to open switchg55.` This`switch remains open for `only a short interval of time and is `thenclosedyit will bey ofthe switch 58" and 3, and cam .con-l. y

operated" isfopened, whereupon the magnetic switch 1:is opened, thusfie-energizing the` the automatic stopping ofthe press, thus fpreventing damageto the extrudingpunclr and die,"

which might otherwise be causedrby the;pile`up of extruded materialonithepunch and inthe die ir the press were permitted to continue tooperate after failing 'to properlydischarge an extruded container. l i lv In orderto `rel-start the operationof the press after it harsbeenautomaticallystopped as 'de`` scribed above, the' switch581is releasedaiterrst `removing the extruded` material from the punch andfdie. `Thereleaseof switch 58 results injthe bridging of its upper contactathereby ref-estab` "lishing the energizing circuit for magnetic switchclosed again just pri-orto the reopening ofswitch 34 `through therestoration of switch closing cam f 31 to its original position by themovement of blank feeding arm` 22 in feeding anotherblank into the diecavity, as described above. This,`

z by again depressing the 59",-\wher`eupon this switch is again closed,`Thus,

switch 58, the `operation of thepressmay be resumed,` and byholding'this switch inthe depressed` position, the press will operatecontinuously in.` automatically recurring cycles,` as described above,until it is again! auto-r matically stopped dueto its failure toproperly eject a previously extruded container.

`It should be understood that the; invention is not limited to theparticular embodiment thereof.

herein illustrated and described, except insofar as is dened in theappended claims.

What is claimed is: f 1. In an extruding press, an extruding die hav-`ing a blankreceiving cavity, means for feeding a blank into sai-dcavity, a reciprocatory extruding punch for `cooperating with thelrliecavity` to extrude an article froma blank inserted in said diecavity, means forejecting extruded articles from s aidpunch and die,`circuit means for initiating the operation of said extruding press`including an electromagnetic tromagnetic means, and a control switchfor controllingthe energization of said magnetic switch, means operatedin timed relation to said blank feeding means for actuating said controlswitch whereby said control switch is opened during an interval of eachcycleiofoperation of'fsaid press, a normally open switch operable tosupply currentto said magnetic switch `whileysaid control n switch isopen, and `means actuated by an ejected article for `closing saidnormally open switch wheneveran article is ejected. l

2. Inan extruding press, an extruding die having a blankl receivingcavity, means for feeding a blank into said cavity, a reciprocatoryextrud- I ing punch for cooperating with the die cavity` to extrude anarticle from a blank inserted in. said die cavity,` means operable intimed relation to said punch and die for ejecting extruded articles`from said punch anddie, means for controlling the operation of saidextruding punch including an electrically operatedmeanaa normally open7f electrical switch operable upon closure to supply operating` currentto saidl electrically operated completes onecycle "of operation ofthepress, and it vwill be understood-that -by holdingswtch 58 depressed,the press` will be caused to operate operating coil' BD 1 of the clutchoperatingsolenoid. This results in clutch 'operating `means, armanuallyactuated switch, a magnetic switch for maintaining said circuit tosaidlelecmeans, means actuated by ejected articles for closing saidswitch, means actuated by said blank feeding means for restoring saidnormally open switch to normal condition, a normally closed electricalswitch to supply operating current to said electrically operated means,means for momentarily` opening said normally closed switch closed andnormally open switches for breaking the circuit to said electricallyoperated means when both of said switches are Open.

i 3. In a forming press, article forming means, means for feeding blanksto said formingmeans, means for discharging formed articles from saidmeans actuated by said blank feeding means forv restoring said normallyopen switch to normal.

4. In a forming press, article forming means,

.means for feeding blanks to said forming means,

, portion of the cycle of the cam and permitting forming means,operating means including a shaft for operating said forming means, acamon said shaft for operating said blank feeding means, electricallyenergized means for initiating the 1 operation of said operating means,-a manually operable switch for closing a current supply cir-v cuit tosaid electrically energized means, a normally closed switch forsupplying current to said manually operable switch, a normally openswitch operable to supply current tosaid manually operable switch whenthe normally closed switch is open, means actuated by dischargedarticles for operating said normally open switch, and

said switch to open for a small portion of the cycle of the cam, asecond electrical switch normally held in an open position andpositioned to be closed by discharged articles, means actuated by the`blank feeding means for restoring said second switch to its normalposition, a clutch operating means for causing the forming means tooperate, and an electric circuit for energizing the clutch operatingmeans including a magnetic switch having an energizing coil and contactsclosed thereby and held operated by either of said electrical switches.and a two position manually operable switch operable in one position tocomplete a circuit through either of the electrical switches arid thecoil of the magnetic switch to energize the magnetic switch and operablein the other position to complete a circuit through either of saidelectrical switches and the contacts of the energized magnetic switch tothe clutch operating means.

RALPH J ONGEDYK.

